Convert jmr3927_clock_event_device to more generic
txx9tmr_clock_event_device which supports one-shot mode. The
txx9tmr_clock_event_device can be used for TX49 too if the cp0 timer
interrupt was not available.

Convert jmr3927_hpt_read to txx9_clocksource driver which does not
depends jiffies anymore. The txx9_clocksource itself can be used for
TX49, but normally TX49 uses higher precision clocksource_mips.

Wait, you're not registering TXx9 clocksource anyway, so it's only taking
space indeed. Maybe we should register clock source/event regardless of the
value of CCFG.TINTDIS, and let them be selected according to rating?